The diffuser acts as an expansion chamber to manage the air as it exits from underneath the car and reintegrates it with higher-pressure ambient air. Smoothing this transition reduces turbulence and drag in the car's wake and improves airflow under the car.
Do rear diffusers do anything?
The main function of a car rear diffuser effectively increases the vehicle's downforce and increases the car's grip on the road surface and reduce the aerodynamic drag. As the car moves down the road, air at high speed is passing underneath the car at low pressure.
How do diffusers work on race cars?
With this in mind, the role of the diffuser on a racing car is to speed the airflow up underneath the car, reducing its pressure, creating a greater difference in pressure between the upper and lower surfaces of the car. This means more downforce and aerodyamic grip, allowing the car to corner faster.
What do diffuser fins do?
What is the purpose of the vertical fins on the rear diffuser? The vertical fins help keep the laminar airflow (air flowing in a smooth path) out the back of the vehicle, without these vertical fins the air can become turbulent (airflow crossing directions).
Does a rear diffuser make your car faster?
Similar to an airplane wing or the rear spoiler of the car, the car rear diffuser makes use of Bernoulli's Principle to decreases the air pressure beneath the car and increase the speed of the air.
Does a diffuser make your car faster?
The airflow accelerates along the throat of the diffuser due to the venturi effect, which in turn creates the desired low pressure under the body of the car. High-quality diffusers in cars also help reduce aerodynamic drag and enhance the speed and performance of the vehicle.
What's the point of a rear diffuser?
A diffuser, in an automotive context, is a shaped section of the car rear which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere.
Do car diffusers really work?
It works by accelerating the velocity of the airflow underneath the car. A poorly designed front diffuser can create a low pressure region toward the front of the car which slows the air behind it down and reduces the effectiveness of the rest of the underbody.